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Messages - apbedford

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1
Lister Based Generators / Re: Startomatic wiring advice
« on: July 01, 2019, 02:21:39 PM »
Sorry, meant Detection Circuit resistance, DR

AB T

2
Lister Based Generators / Re: Startomatic wiring advice
« on: July 01, 2019, 02:04:58 PM »
Hi Bob

I've rewound the coil to 100 ohms as per original: just wanted to make sure what the rating for the load resistor DR would need to be to drop the initial voltage in the detection circuit from 24 to 12, as my coil is definitely from a 12V setup: you had originally said 5W, 6.8K ohms, which I have, but unfortunately being hopeless at electrics myself, I would have thought that it should be a far lower resistance. Presumably any load resistance has to be included in the calculation, so: coil resistance, plus load resistance, plus load resistor DR. I wondered if you would mind just explaining how it works!

All best
Tony

3
Lister Based Generators / Re: Startomatic wiring advice
« on: June 27, 2019, 09:42:28 AM »
Hi Bob, thank you, I was wondering how to adjust the winding - excellent method.

Iíve ordered the wire, so will see how I get on. Any tips like that much appreciated!

All best
Tony

4
Lister Based Generators / Re: Startomatic wiring advice
« on: June 26, 2019, 06:41:07 PM »
On second thoughts, maybe the original was 0.224 after all, which would make sense. Difficult to tell even with calipers and feeler gauges.

5
Lister Based Generators / Re: Startomatic wiring advice
« on: June 26, 2019, 05:35:28 PM »
Hi Bob

I finally made a bit of time to inspect the control panel. It turns out that the D1 relay, which starts the whole sequence, was U/S - it looks as if it has been overheated in the past.

I thought that I would rewind it, but just wanted to check with you whether you happened to know the specs. My original had 100 ohms stamped on it, and I estimate that I removed about 245 meters of enamelled wire, trying to measure it as I went.

Anyway, to make the numbers work, I'd need to use 245 m of 0.224 mm wire (31 gauge) - giving about 100 ohms, but I'm pretty sure that what was on there originally is finer than this - I make it somewhere between 0.18 mm and 0.20 mm (33/32 gauge). 245 m of this would give me between 135 and 160 ohms.

Any comments? I'm sure that you guys have had to do a few rewinds like this!

All best
Tony

6
Lister Based Generators / Re: Startomatic wiring advice
« on: June 19, 2019, 11:58:48 AM »
Many thanks Bob

Unfortunately, I have to go to work for the next couple or three days - all very regrettable, as I am meant to have more or less retired! However, I will be back with you after that, pestering for more information. I'm most grateful for your patience and assistance. It may well be over quite a bit of time - electrics have never been my strong point, although I am reasonably handy in mechanics and other stuff.

All best
Tony

7
Lister Based Generators / Re: Startomatic wiring advice
« on: June 19, 2019, 09:40:08 AM »
Hi Bob

It does seem to be slightly unusual, as far as I can gather from other pics that I have seen, but those relays on the left definitely separately energise the fuel and decompression solenoids (which are as in your pic, on the engine). I had to check them when I was working out the remote switching, and they both operate immediately on pressing the start button (so on 24V), followed by the start relay. Iím not sure how the line contactor functions, or where it is in that set up.

I have ordered the capacitor and power resistor that you recommended: in your control box picture, there is also what appears to be a small variable wire wound resistor, at the top on the right, and a variable rheostat on the top left next to your rebuilt reset switch arrangement. Are those anything to do with the 24v/12v step-down?

All best
Tony

8
Lister Based Generators / Re: Startomatic wiring advice
« on: June 18, 2019, 08:22:53 PM »
Thanks Bruce, that's helpful

9
Lister Based Generators / Re: Startomatic wiring advice
« on: June 18, 2019, 04:21:11 PM »
Hi Bob

I have attached a pic of the top box. The two relays on the left are fuel and decompression. There is a further hefty one at the top towards the right which I thought was the start relay, but I may well be wrong!

Many thanks for the details so far, I will start getting those items on order. Also, can you advise about the replacement bridge rectifier for the one inside the generator? Is it something like the pic attached?  It's rated 1200V 100A, single Phase, 4 terminals. There's a similar one with screw terminals, 1600V 100A single Phase.

All best
Tony

10
Lister Based Generators / Re: Startomatic wiring advice
« on: June 18, 2019, 10:42:20 AM »
Hi Bob, thank you so much for your assistance. I am away from the project right now, but will upload a pic of the set top box. It certainly has two relays for fuel and decompression, but there is another very large relay that I thought was the starter that you referred to. Iíll get this pic later today for you to have a look at.

All best
Tony

11
Lister Based Generators / Re: Startomatic wiring advice
« on: June 17, 2019, 11:20:56 PM »
PS Here is a pic of the panel that I have available to work with.

12
Lister Based Generators / Startomatic wiring advice
« on: June 17, 2019, 11:09:22 PM »
I am a newbie to the Forum, seeking advice on SOM controls.

I have an SR2 with Brush generator, 4.5Kw, which is in very good working order. It was used as a backup generator, and came with the house when we bought it 25 years ago. It was well cared for, and must have been used very infrequently. It seems a good example of the type. It has always worked perfectly reliably when I have had call to use it. However, it is button/remote start, and has no separate control panel other than the alternator cubicle. I will be moving house soon (certainly not going to leave it behind!), and would like to be able to use it as SOM rather than push start.

I have recently acquired an SOM control panel, which was for a 12V, 1.75Kw model, schematic ED6443. This isn't in particularly good condition, but appears to have most of the principal SOM components. I have several schematics from this Forum, including the SOM "generic" schematic, and have spent some time reading the excellent posts. However, I really need some help and advice.

I would like to see if it would be possible to make the necessary tests, modifications and wiring alterations to convert the set-up to SOM, really as a project, somewhat inspired by Forum members who have completely renovated control panels, but have retained the original Lister equipment - or most of it, anyway, even if not the old selenium rectifiers. Btw, these have already been removed and replaced with modern diodes on my control panel.

The current alternator cubicle contains everything necessary in the way of fuel control relays, decompression and recompression, but I have no idea how to wire in the SOM panel (if indeed it is feasible). I realise, for a start, and probably even before testing the panel for functionality, that there will have to be a voltage step down from 24V to 12V, which I believe is achieved by a rheostat (item BR on one of the diagrams).

Anyway - any thoughts, advice, diagrams, pictures and opinions gratefully received!

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